Add cli-plugin-unit-mocha

package.json

@@ -7,6 +7,7 @@
     "build": "vue-cli-service build",
     "lint": "vue-cli-service lint --no-fix",
     "lint:fix": "vue-cli-service lint",
+    "test:unit": "vue-cli-service test:unit",
     "i18n:report": "vue-cli-service i18n:report --src './src/**/*.?(js|vue)' --locales './src/locales/**/*.json'"
   },
   "dependencies": {
@@ -20,9 +21,12 @@
   "devDependencies": {
     "@vue/cli-plugin-babel": "^3.10.0",
     "@vue/cli-plugin-eslint": "^3.10.0",
+    "@vue/cli-plugin-unit-mocha": "^3.10.0",
     "@vue/cli-service": "^3.10.0",
     "@vue/eslint-config-standard": "^4.0.0",
+    "@vue/test-utils": "1.0.0-beta.29",
     "babel-eslint": "^10.0.1",
+    "chai": "^4.1.2",
     "eslint": "^5.16.0",
     "eslint-plugin-vue": "^5.0.0",
     "sass": "^1.18.0",

tests/unit/.eslintrc.js

+module.exports = {
+  env: {
+    mocha: true,
+  },
+}